Edelbrock 6566 User manual

©2000 Edelbrock Corporation
Rev. 12/00 Catalog #6566
Page 1of 2
EDELBROCK HEADER - CATALOG #6566
for 1988-1995 Pick-Up 5.0L, 5.7L V8 TBI without A.I.R. &
1992-1995 Suburban, Blazer, Tahoe, Jimmy, Yukon, 5.0L,
5.7L TBI without A.I.R.
INSTALLATION INSTRUCTIONS
PLEASE study these instructions carefully before installing your Headers. If you have any questions or problems, please
call our Technical Hotline at: 1-800-416-8628 from 7:00 am - 5:00 pm, Monday-Friday, Pacific Standard Time or
e-mail us at [email protected]. Please fill out and mail your warranty card.
HEADERS: These components are designed to improve the exhaust efficiency of the GM T.B.I. (Throttle Body Injection) V8
engine. This system does not require welding for installation and retains all O.E.M. emissions equipment. These
Edelbrock headers are street legal in all 50 states.
SUGGESTED TOOLS FOR INSTALLATION: This vehicle has metric fasteners.
❑3/8" ratchet socket set with extensions and universal 13mm and 15mm swivel sockets
❑Combination set of open-end wrenches
❑Jackstands, screwdrivers, pliers, crescent wrench, etc.
❑Liquid penetrant, (GM #1052627) anti-seize compound (GM #5613695)
Note: Some models will require a special steering pulley, K-D #2897 or equivalent
SPECIAL NOTICE: This Edelbrock part has received an Executive Order (E.O. #) from the California Air Resources Board
(C.A.R.B.)makingitlegalforstreetuseonpollution-controlledmotorvehiclesinall50states. Toassistyouwithemissions
equipment certification, we have included a silver fan shroud decal to help testing personnel verify that this part is a legal
replacement part on the vehicle for which it is cataloged. The adhesive-backed decal should be affixed to your fan shroud
next to the existing emission and engine specification decal. Do not cover your original equipment specification decal with
the Edelbrock fan shroud decal.
WARNING: The use of "Thermal Wrap" or any aftermarket coating process will void the warranty on your
headers. Those products can cause excessive heat and moisture buildup resulting in corrosion and early
failure of the system.
NOTE: High temperature spark plug wires and boots are recommended to withstand heat from Headers.
DISASSEMBLY
1. Disconnect negative battery cable.
2. Raise vehicle and disconnect 02 sensor.
3. Unbolt stock exhaust pipes from manifolds.
Right Side
1. Disconnect air intake assembly.
2. Disconnect and remove spark plug wires.
3. Unbolt dip stick tube.
4. Unbolt and remove manifold.
5. Install flange gasket and header from top. Install
header bolts, lock washers, and thick flat washers
supplied, ensure proper alignment and tighten
bolts.
NOTE: Thick washers are to be used on slotted
holes of port flange.
6. Re-install spark plug wires.
7. Re-fasten dip stick tube using spacer and bolt
supplied in kit (if needed).
8. Replace air intake assembly.
9. With wire ties, route any hoses, wires or lines away
from headers as necessary.
10. If your vehicle is equipped with a hot air tube,
install the supplied heat stove stack with the
clamps to #1 primary tube of right side header.

©2000 Edelbrock Corporation
Rev. 12/00 Catalog #6566Page 2of 2
Left Side
1. Disconnect and remove spark plug wires.
2. Remove power steering pump support bracket.
In order to remove the OEM bracket, attach with
the two front manifold bolt. It may be necessary
to remove the power steering pump pulley. This
requires the use of a special power steering
pulley puller, such as K-D #2897.
3. Disconnect temperature sensor wire.
4. Unbolt and remove manifold from top side.
5. Install flange gasket and one 3/8"-16 x 1" bolt,
lock washer, and flat washer at rearmost bolt
hole (leave bolt loose enough to accept Header).
6. Install left side Header from top side.
7. Install all but the front two bolts and washers on
left side (do not tighten at this time).
8. Re-install rear power steering support bracket.
Do not tighten at this time.
9. Re-install accessory bracket which mounts to
the first two bolt holes on left side with 2-3/4"
ferry bolts, lock washers, and 1-1/2" spacers
supplied. Use the spacers only between the
manifold flange and the accessory bracket; use
a 3/8" lockwasher under the head of the ferry
bolt.
10. Align all parts and tighten left side bolts and nuts
at this time.
11. Re-install spark plugs and re-connect wires on
left side.
12. Re-install temperature sensor wire to
temperature sensor.
13. Re-install O2 sensor. Use anti-sieze on threads
of sensor and torque to 30 ft./lbs. Re-route O2
sensor wire from loom to O2 sensor making sure
all wires are clear of exhaust (O2 sensor
extension wire is included in kit).
ASSEMBLY OF EXHAUST PIPE
1. Usingsuppliedhardware and new donut gaskets
on both sides, re-attach the factory extension
pipes to the headers, and tighten bolts evenly to
ensure a tight seal.
FINAL INSPECTION
1. Check all lines (hydraulic, vacuum, air
conditioning and fuel) to ensure there is
adequate clearance to headers. Use wire ties as
needed.
2. Re-connect battery.
3. At this point, it is a good idea to look everything
over and make sure that nothing was missed in
assembly.
4. Start vehicle and bring up to normal operating
temperature. Check for possible leaks.
5. Turn engine off and let cool. Tighten all bolts
again.
HARDWARE SUPPLIED
Qty. Description Qty. Description
❑1#25-9151 Header left side ❑4Hardened washers (for header flange slotted holes)
❑1#25-9152 Header right side ❑1Heat stove stack
❑12 Hex header bolts ❑21 3/4” Hose clamps
❑2Port gaskets ❑63/8” Hex nuts
❑2Donut gaskets ❑25/8” O.D. spacers
❑63/8” Hex capscrews ❑13/8” O.D. spacers
❑18 3/8” Lock washers ❑1O2 Sensor plug
❑63/8” Flat washers ❑1O2 Sensor wire
❑23/8” CB bolts ❑3 Wire ties
❑11/4 Hex capscrew
Edelbrock Corporation
2700 California St.
Torrance, CA 90503
Tech Line: [phone]
Office: [phone]
E-Mail: [email protected]